Wheeled distance measuring device

Abstract

A wheeled distance measuring device has a longitudinal pole, a housing, a wheel, a gear coupling mechanism, and a transmission assembly. The housing is attached to the longitudinal pole and has a fork. The counter is mounted in the housing and has a spindle and a gear mounted on the spindle. The wheel is mounted rotatably on the fork and has an axle and a spur gear mounted on the axle. The gear coupling mechanism is mounted on the fork and has a stem, an upper spur gear, and a lower spur gear engaged with the spur gear on the axle of the wheel. The transmission assembly is mounted on the housing and has multiple gear elements. One of the gear elements is engaged with the gear on the spindle, and another one of the gear elements is engaged with the upper spur gear.

What is claimed is: 
     
       1. A wheeled distance measuring device comprising:
 a longitudinal pole having a lower portion; 
 a housing attached to the lower portion of the longitudinal pole and having a fork extending from the housing; 
 a counter mounted in the housing and having a spindle having an end extending out of the housing and a gear mounted on the end of the spindle; 
 a wheel mounted rotatably on the fork of the housing and having an axle and a spur gear mounted on a free end of the axle; 
 a gear coupling mechanism mounted on the fork and having 
 a stem mounted rotatably on the fork, formed as a single piece, and having two ends; 
 an upper spur gear and a lower spur gear mounted respectively on the two ends of the stem, and the lower spur gear engaged with the spur gear on the axle of the wheel; 
 a transmission assembly mounted on the housing between the gear on the spindle of the counter and the upper spur gear and having multiple gear elements, wherein one of the gear elements is engaged with the gear on the spindle of the counter, another one of the gear elements is engaged with the upper spur gear, and all of the gear elements of the transmission assembly are spur gears. 
 
     
     
       2. The wheeled distance measuring device as claimed in  claim 1 , wherein
 the housing further has 
 an upper supporting protrusion formed on and protruding from an upper portion of the fork; and 
 a lower holding protrusion formed on and protruding from a lower portion of the fork; and 
 the stem is rotatably mounted on and supported by the upper supporting protrusion and the lower holding protrusion. 
 
     
     
       3. The wheeled distance measuring device as claimed in  claim 2  further comprising a cover attached to the housing to hold the gear coupling mechanism and the transmission assembly inside. 
     
     
       4. The wheeled distance measuring device as claimed in  claim 1  further comprising a cover attached to the housing to hold the gear coupling mechanism and the transmission assembly inside.